Drill cutter mounting



July 13, 1937. F. scoTT ET AL DRILL CUTTER MOUNTING Filed Sept. 8, 1954 `INVENTOR` Bywu UEM ATTORNEY Patented. July 13, 1937 g 2,086,680 n UNITED STATES PATENT lOFFICE DRILL CUTTER MOUNTING Floyd L. Scott and Lewis E. Garfield, Houston, Tex., assignors to Hughes Tool Company, Houston, Tex., a corporation of Texas l Application September 8, 1934, Serial No. 743,238

12 claims. (c1. 255g-73) Our invention relates to a means for mounting ferrule or collar I2 set within a cylindrical recess cutters on the head of a well drill, a reamer or the in the inner side wall of the pocket. The wall is like. v formed with a shallow recess of larger diameter 5 It is an object of the invention to provide a about the shaft recess to receive a washer I3 cutter bearing so constructed and supported as to mounted eccentrically upon the shaft. As will be be readily assembled and mounted in operative seen from Fig. 4 the recess for the washer is not Position. entirely closed on its lower side.

It is a further object to provide a support for .The cutter shaft is formed with a ball race at the cutter shaft which may be renewed When` I4 toward the inner end of the cutter bearing. 10 worn and thus remedy the rapid wear which takes This race has a slight ridge bounding it on its inplace about the lower end of the drill head in ner side at I5 and a ridge I6 on its outer margin. some formations. The cutter also is grooved to provide a race to Itis another object to provide a support which receive the balls IY'I which by tting in grooves may be adjusted when necessary to take up wear partly in the shaft and partly in the cutter hold 1 in use. said cutter from longitudinal movement on the We also desire to provide an improved bearing said shaft. The balls are inserted into said racefor the cutter which bearingl is capable of easy way, after the cutter is mounted thereon, assembly. through a bore or opening diagonally through the Other features of value in the invention will pin as will be seen in dotted lines at I8. When more clearly appear from the drawing herewith the balls have been insertedthe bore is filled by 20 1D0n which: a steel plug I9 Welded in place. There is a row Fig. 1 is a central longitudinal sectional view of cylindrical roller bearings 20 on the shaft adthrough a well drill embodying the invention. jacent the outer wall of the pocket. Fig. 2 is a transverse section on the plane 2-2 'Ihe outer end of the cutter shaft is supported 0f Fig. 1. in a recess in the inner face of the plate 23 formed 25.

Fig. 3 is a side elevation of the shaft support upon a rocker arm 24 set in the head of the drill.

removed from the drill head. An eccentric projection 25 on said shaft extends Fig. 4 is a broken section on the plane 4--4 o1'v -into an opening through the plate.

Fig. 1, illustrating the inner shaft support. The ridge 3 has a central vertical slot or groove We have illustrated the invention as applied to 26 in which the rocker arm 24 is mounted. 'Ihe 30 a multistage well drill of common construction. plate 23 on said arm is of the full width'of the There is a head I having an upper threaded rib or ridge 3 and ts below an inclined shoulder shank 2 for connection with a drill collar or on the ridge indicated at 21 in dotted lines. The coupling. Said head is formed with a plurality army is supported upon a pivot pin 28 extending of longitudinal ribs or ridges 3 thereon which, as transversely of the groove 26 and held in position 35 will be described, are recessed to support the by a dowel pin29 or other similar means. cutters. We have shown three such ridges. The upper end of the rocker arm is curved in- The lower portion 4 of the head is reduced wardly and has a threaded opening 30 therein somewhat in outer diameter and has a tapered to receive a set screw 3l, the inner end of which socket 5 threaded to receive the shank 6 of a sh- -isadapted to contact with a shoulder on the inner 40 tail bit 1, or any other desired type of bit. 'Ihe wall of the groove 26. It will be seen that the head has an axial passage 8 therethrough for thetightening of the set screw 3l will move the upper flushing fluid. end of the arm 24 outwardly and tighten the plate The cutters'9, whose mounting forms the sub- 23 upon the arm inwardly against the cutter ject matter of our invention, are housed in upshaft. There is a slight ridge on the inner face 45 wardly and inwardly inclined slots or pockets Ill` of the arm about the shaft at 32, which engages extending from the lower shoulders of the ridges slightly within the end of the cutter to prevent 3 upwardly. Said cutters are thus positioned to loss of the cutter if the shaft should break. cut the wall of the hole in such manner as to en- In assembling the cutters upon the head each large the bore cut by the forward bit 1. Said cutcutter Will be mounted on its shaft and the row 50 ters are of truste-conical shape, tapered inwardly of locking balls I'I will be inserted and the bore and toothed longitudinally. I8 stopped by its plug. The shaft will then be Each cutter is mounted upon a bearing shaft I I inserted into the pocket from the outer side with set transversely of the pocket III and is supported the end of the shaft in the recess or ring I2. The at both ends. The inner support is formed by a rocker arm will then be secured in pla/ce with the 55 eccentric projection 25 on the cutter shaft fitting with the opening in the head ofthe rocker arm. The set screw 3l may then be tightened to hold the shaft securely against longitudinal movement.

It is to be .noted that when cutters are changed, the shafts or the rocker arms or both of them may be also easily renewed. By removing the rocker arm, the cutter-receiving pocket is open on its outer side so that easy access tothe cutter`and shaft is possible. Further, if wear upon the cutter or the shaft should occur the tightening of the set screw will tend to retain the cutter against rattling or wobbling until it is worn out.

y What we claim as new is:

l. In a well drill, a drill head, pockets in the sides of said head. a shaft extending transversely in each of said pockets, a plate forming the outer wall of each of said pockets and acting to support the end of a shaft, means to support said plate for adjustment toward and away from said pocket, shoulders on said plate at its upper end adapted to engage said head when said platle is adjusted inwardly into supporting position beneath said head, and cutters on said shafts in said pockets.

2. In a well drill, a head, a pocket therein, shoulders above said pocket, a radially movable plate forming the outer wall of said pocket, a cutter shaft extending transversely across said pocket and supported at its outer end in said plate, means on said plate engaging said shoulders to resist upward movement of said plate, and a cutter on said shaft.

3. In a. well drill, a head, a pocket therein, a shaft therein extending transversely thereof, a cutter on said shaft,.a row of balls adapted to roll in a raceway partly in said cutter and partly in said shaft to secure said cutters against movement longitudinally of said shaft, said balls being introduced to said raceway through a bore in said shaft when said cutter is in place thereon and removable means movable longitudinally relative to said shaft to support the outer end of said shaft.

4. In a. well drill, a head, an upwardly extending cutter pocket therein, a shaft in said pocket disposed transversely thereof, said shaf-t being supported at its inner end in a recess in the side wall of said pocket, an arm mounted in said head closing. the outer side of said pocket, a support in said arm for the outer end of said shaft, said arm being laterally adjustable ,to tighten against said shaft, and a. cutter in said pocket upon said shaft.

5. In a well drill, a head, an upwardly extending cutter pocket therein, a shaft in said pocket disposed transversely thereof, said shaft being supported at its inner end in a recess in the side wall of said pocket, an arm mounted in said head closing the outer side of said pocket, a support in said arm for the outer end of said shaft, said arm.

being laterally adjustable to tighten against said shaft, an annular ridge on said arm to engage within a cuttenand a cutter in said pocket upon said shaft.

6. In a well drill, a head, cutter pockets in said head, cutters in said pockets, cutter shafts transversely of said pockets, said shafts being supported at one of their ends in the inner walls of said pockets, arms pivoted on said head, a plate on each of said arms closing one side of each of said pockets, and supports in said plates for the outer ends of said '7. In a well drill, a head having a. plurality of radial ridges thereon, cutter 'pockets inclined upwardly and inwardly in said ridges addacent their lower ends, cutter shafts in; said pockets transversely thereof, said shafts beingl supported at their inner ends in recesses in said head, arms pivoted on the head in grooves in the outer faces of said ridges, supports in the ends of said arms for said shafts, and cutters on said shafts.

8. In a well drill, a head having a plurality of radial ridges thereon, cutter pockets inclined upwardly and inwardly in said ridges adjacent their lower ends, cutter shafts in said pockets transversely thereof, said shafts being supported at their inner ends in recesses in said head, arms pivoted on the head in grooves in the outer faces of said ridges, a supporting plate at the lower end of each of said arms, non-rotatable supportsin said arm plates for said. cutter shafts and cutters on said shafts. f

9. In a well drill, a head, a. plurality of upwardly and inwardly inclined pockets in said head, cutter shafts in said pockets transversely thereof, supports for the inner ends of said shafts in the inner walls of said pockets, arms set in longitudinal grooves in the outer periphery of said head, pivot pins upon which said arms are rockably mounted,

a support in one of the ends of each of said arms to retain the outer end of a shaft and cuttersv on said shafts.

10. In a well drill, a head, a plurality of upwardly and inwardly inclined pockets in said head, cutter shafts in said pockets, transversely thereof, supports for the inner ends of said shafts in the inner walls of said pockets, arms set in longitudinal grooves in the outer peripheryof said head, pivot pins upon which said arms are rockably mounted, a support in one of the ends of of said arms to retain the outer end of a shaft, means in the other end of each of said arms adapted to engage the head and adiustabletn force and hold said support firmly against said Vshaft and cutters on said shafts.

11. In a wen drm, a head, a pocket therein, 's

laterally adjustable plate forming the outer wall of said pocket, a cutter on said shaft, a rowof balls interiitting Abetween said cutter and shaft, and means whereby said balls may be inserted into position while' said cutter is on said shaft, and before said shaft is mounted in said head.

morn n sco'rfr. LEWIS E. GARFIELD. 

